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OPERATION & MAINTENANCE MANUALRHS780Refrigerant Handling StationMAHLE Aftermarket Inc., RTI Division10 Innovation DriveP.O. Box 3099York, Pennsylvania USA 17402717-840-0678 (Ext. 259)Web: www.rtitech.comE-mail: tech@rtitech.com035-81123-00
TABLE OF CONTENTSRHS780Before Using the RHS780 . . . . . . . . . . . . . . . . . . . . . . . . 3Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Using the RHS780 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Filling the Charge Cylinder . . . . . . . . . . . . . . . . . . . . . . . . 6Recover/Recycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7Draining Recovered Oil . . . . . . . . . . . . . . . . . . . . . . . . . . 8Deep Vacuum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Charging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Automatic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11Accessing Stored Data . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Setting Over Charge Amount . . . . . . . . . . . . . . . . . . . . . . 14Scheduled Maintenance & Filter Maintenance . . . . . . . . . 15Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16Solenoid, Pressure Switch & Contactor Identification . . . 18CONGRATULATIONSYou have purchased one of the finest Recovery, Recycling and ChargingMachines available! Fill out and return the Warranty Card within 90 daysto activate warranty and free lifetime technical support.Page 2
BEFORE USING THE RHS780Check for any shipping damage. Place a claim with carrier if damage is discovered. DO NOT USE A DAMAGED UNIT.Complete and return the Warranty Card to activate technical support service and warranty coverage.These general instructions describe normal operation and maintenance situations encountered with the RHS780.Failure to read and comply with these instructions or any one of the limitations noted herein can result in serious injuryand/or property damage.A few minutes spent reading these instructions can make an operator aware of dangerous practices to avoid andprecautions to take for his own safety and the safety of others. The instructions should not be interpreted to anticipateevery possible contingency.The RHS780 should not be operated or serviced by any person who has not read all the contents of this manual.It is the responsibility of the owner/user to operate the RHS780 in accordance with all specifications and laws whichmay apply.A regular schedule of inspection of the RHS780 should be established and records maintained with special attentiongiven to Hoses, Vacuum Pump Oil Level, and Filters.SAFETY PRECAUTIONSRecover, Recycle, and Charge only the refrigerant for which the machine is configured.Wear safety glasses and protective gloves. Refrigerant has a very low boiling point and can cause frostbite.Follow the RHS780 operating procedures sequentially to avoid prematurely disconnecting hoses or opening valveswhich may release refrigerant to the atmosphere.Do not expose the RHS780 to moisture or operate in wet areas.Use the RHS780 in locations with mechanical ventilation that provides at least four air changes per hour.Hoses used with the RHS780 must have shutoff devices within 12 inches (30 centimeters) of the connection point tothe A/C System to minimize the introduction of Non-Condensable Gas (Air) into the RHS780 and the release ofrefrigerant when being disconnected.Disconnect power before performing any maintenance or service on the RHS780.Connect the RHS780 to a properly grounded receptacle. Do not over load the circuit.Avoid using an extension cord with the RHS780. If necessary use a good condition three wire, grounded, #14 AWG(2.0 mm2) or larger extension cord of the shortest possible length.Do not connect the RHS780 to the liquid side of any A/C System with a capacity greater than 4 lbs (1.8 Kg.)Refrigerant in A/C Systems having larger capacities must be recovered from the vapor side only.Never connect the Red or Blue Hose on the rear of the RHS780 to the Liquid Port of a Cylinder of Refrigerant to fillthe Charge Cylinder. Doing so may cause the Compressor to fail and void the warranty.Avoid breathing refrigerant or lubricant vapor or mist. Exposure may irritate eyes, nose and throat. If accidental systemdischarge occurs, ventilate work area before continuing.Additional health and safety information may be obtained from refrigerant and lubricant manufacturers.Special Considerations with R134aR134a has been shown to be nonflammable at ambient temperature and atmospheric pressure. However, tests undercontrolled conditions have indicated that at pressures above atmospheric and with air concentrations greater than 60percent by volume, R134a can form combustible mixtures.While it is recognized that an ignition source is also required for combustion to occur, the presence of combustiblemixtures is a potentially dangerous situation and should be avoided.Under no circumstances should any equipment be pressure tested or leak tested with Air and R134a mixtures. Do notuse compressed air (shop air) for leak detection in R134a systems.Page 3
USING THE RHS780Note: The purpose of this discussion is to familiarize the user with the features and functions of the RHS780 RefrigerantHandling Station. The procedures discussed in this manual assume that the RHS780 has been set up in accordancewith the figures which are referred to and that the RHS780 has been connected to the proper power supply. Thismanual does not illustrate correct A/C service but rather how to correctly use the RHS780.The RHS780 is microprocessor controlled with a menu driven user interface. All of the functions of the RHS780 areaccessed by pressing a few simple key strokes and following the prompts. The on board Charging Cylinder is attachedto a strain gauge measuring device and the weight is electronically displayed.The RHS780 has a Fill Cylinder feature that allows refrigerant to be loaded directly into the Charging Cylinder without goingthrough the normal Recover/Recycle mode. When selected, this feature allows the RHS780 Charging Cylinder to be refilled in just a few minutes at which point it will automatically stop at approximately 35 lbs (16 Kg.)The RHS780 Recovers and Recycles simultaneously in a true “single pass” through the filters and stores the refrigerantin the Charging Cylinder where it is immediately available for use. This process automatically stops at 39.5 lbs (18 Kg) orwhen a 15"Hg (-0.5 Bar) vacuum is sensed. The RHS780 will wait for a minimum factory default of two minutes for “outgassing” and cold refrigerant to raise the pressure back up to 3 psig (0.2 Bar) which would cause the Recover/Recycleprocess to start again and reset this two minute Recycle Hold Timer before displaying that the process is complete. TheRecycle Hold Timer can be changed every time a Recover/Recycle procedure is run. Longer times should be selected oncolder days or on A/C Systems with large liquid capacities. Increasing this value may increase total time toRecover/Recycle while decreasing the time may result in an incomplete Recovery of the A/C System. Refer to the chartbelow for guidelines on setting the Recycle Hold Timer. The value entered is stored in the memory of the RHS780 andbecomes the “default” value each time it is set. Non-Condensable Gases are vented automatically duringRecovery/Recycle. The Amount of refrigerant Recycled is displayed at the end of the procedure. This value is added tothe Total amount Recycled and stored in the memory of the RHS780 (see Accessing Stored Data on Page 12.)TemperatureRecycle Hold Time 50F (10C)10 min50F (10C) to 80F (26.5C)5 min 80F (26.5C)2 minAn integrated 7 CFM rotary vane style Deep Vacuum Pump draws on both the High and Low Hoses, ensuring completeevacuation of the A/C System. The amount of time that the Vacuum Pump has been programmed to run will “count down”on the display. The value entered is stored in the memory of the RHS780 and becomes the “default” value each time it isset. The Low Pressure Gauge can be used to monitor a rise in A/C System pressure. When programmed to do so, theRHS780 will pause and start a “count up” timer indicating how long the Vacuum Pump has been off, thus allowing theoperator to determine if a vacuum leak is present based on increasing pressure over time. A rapid rise in pressure indicatesthe presence of a large leak that should be repaired. A slow rise in pressure may simply indicate that a longer Recycle HoldTimer or Vacuum Time value should have been entered. A relatively constant vacuum reading over a long period of time(less than 2 InHg [0.07 Bar] rise over ten minutes) is the most accurate way to check for vacuum leaks. The RHS780 canalso be programmed to pause to allow oil to be added, and to the A/C System after vacuuming and prior to Charging.Charging is done via the on board Charging Cylinder. The A/C Capacity is entered via the Keypad. The value entered isstored in the memory of the RHS780 and becomes the “default” value each time it is set. The RHS780 can dispense liquidrefrigerant through either the High or Low Side Hose by changing the position of a selector switch. As refrigerant leavesthe RHS780, the display will show an increasing weight to the programmed charge amount plus a factory set 0.03 Kg (oneounce) Over Charge Amount necessary for compensation of refrigerant loss in the hoses. This Over Charge Amount canbe changed to accommodate different operating conditions (see Setting Over Charge Amount on Page 13.) An integratedHeater automatically engages whenever Charging occurs. The Amount of refrigerant Charged is added to the Total amountCharged and stored in the memory of the RHS780 (see Accessing Stored Data on Page 12.)The RHS780 can be programmed to perform the Recover/Recycle, Deep Vacuum and Charge in a completely Automaticmode. The RHS780 will always go through the Recover/Recycle procedure, but will go immediately to the Recycle HoldTimer if the A/C System is empty. The following matrix outlines the most commonly used options that can be programmedto occur after the Recycle Hold Timer “times out”:Recover/RecycleDeep VacuumVacuum LeakAdd OilChargingXXXXXXXXXXXXXXXXXXXXXXXXPage 4
SETUPHigh SideOil ChargeBottleFill PortAnti-BlowbackValveNewRefrigerantTo Fill PortHigh LowCharge SwitchLow SideOil ChargeBottleOil DrainRe-pressurizationSwitchOil Drain BottleVacuum PumpPage 5
WEIGHT L B FILLING THE CHARGE CYLINDERXX.XAUTOMATIC?5Note:For large capacity or multiple A/C Systems where recharge will NOTbe done between successive recoveries, it may be desirable to skipthis procedure.1.Setup the RHS780 as shown on Page 4 and then turn the Main PowerSwitch ON.Note:The RHS780 uses 37 lbs (17 Kg) of refrigerant when Filling the firsttime. If the Refrigerant Cylinder is emptied the RHS780 will appearto stop filling (the Weight will stop rising) and will stay in thiscondition until the RESET key is pressed.2.Using the Keypad, press the “Up Arrow” key four times to display“WEIGHT XX.X LB” “FILL CYLINDER? 5” and press the ENTER key.The Display will read “CHECK HOSES” “START? 5”.3.Open the LIQUID Valve on the Refrigerant Cylinder connected to the FillPort on the rear of the RHS780 with the Yellow Hose.4.Press the ENTER key when ready to start filling the RHS780. WEIGHT GHT XX.XCOMPRESSORFILLLBONThe Display will read “WEIGHT XX.X LB” “COMPRESSOR ON”. Whenthe level is approximately 35 lbs (16 kg) the RHS780 will turn OFF, theDisplay will read “FILL COMPLETE” “FILLED XX.X LB 5” (the amountof refrigerant removed from the cylinder) and the Attention Light will turnON. Close the Liquid Valve on the Refrigerant Cylinder.COMPLETEFILLED XX.XENTERL B 5 Note: Press the RESET button on the Keypad to stop theFill Cylinder procedure at any time.5.*HIGHSEEPRESSUREThis procedure may be slow or fail to work if the internalcharge cylinder pressure is higher than the pressure in thecylinder of new refrigerant. Check and purge air if necessary(See Page 7).MANUAL**CYLINDERGOTOAlso, try putting a heat belt on the new refrigerant cylinder. orput the cylinder in a container of warm water.FULLCHARGEPress the ENTER key to return to the Main Menu.5*While filling the Charging Cylinder, this screen will display periodicallyconcurrent with the Attention Light turning ON. This is normal andnothing to be concerned about. The screen should revert to normalafter a few seconds.** This screen will display when the Charging Cylinder fills to capacity,approximately 39.5 lbs (18 Kg). If this occurs, the Weight can belowered using the Charging procedure on Page 9 before the RHS780can be used to recover more refrigerant. Press the ENTER key toreturn to the Main Menu.Note:The RHS780 Charging Cylinder can also be filled from the GAS orVAPOR side of a cylinder by following the Recover/Recycleprocedure on Page 6.Note:The RHS780 will use 1.1 Lb (0.5 Kg) more refrigerant than thedisplayed value the very first time it is used or after performing aCalibration Procedure in order to prime the internal components.Note:The Yellow Hose can be removed from the Fill Port and connectedto either the Blue {Low side} or Red {High Side} Hose connectionport on the side of the RHS780 to allow recovering the refrigerantleft over in the Yellow Hose using the Recover/Recycle procedureon Page 6.Page 6
WEIGHT XX.XLBAUTOMATIC?5 WEIGHT XX.XLBRECYCLE?RECOVER/RECYCLE1.Setup the RHS780 as shown on Page 4 and then turn the Main Power SwitchON.2.Attach the Red and Blue Hoses to the A/C System per the vehiclemanufacturer's instructions, open the Red and Blue Hose Valves.3.Using the Keypad, press the “Up Arrow” key one time to display “WEIGHT XX.X LB” “RECYCLE? 5” and press the ENTER key. The Display will read“RECYCLE HOLD” “TIME XX MIN 5”.5ENTERRECYCLEHOLDTIMEMINXX5 ENTERCHECKThe Recycle Hold Time is the amount of time that the RHS780 waits for “outgassing” or for the pressure in the A/C System being recovered to riseenough to automatically restart the recovery process. The minimum value istwo minutes. The value entered is stored in memory and comes up as thedefault value the next time the procedure is used.4.Press the “Up Arrow” key to change the value of the field. Press the “RightArrow” key to change to a different field. Press the ENTER key to accept thevalue. The Display will then read “CHECK HOSES” “START? 5”.5.Press the ENTER key to start recovering and recycling with the RHS780.HOSESSTART?5The Display will read the “WEIGHT XX.X LB” “COMPRESSOR ON”. TheRHS780 will recover and recycle refrigerant from the A/C System andautomatically cycle OFF when a vacuum is sensed. This vacuum level canbe seen on the Low Pressure Gauge. The Display will read “WEIGHT XX.XLB” “COMPRESSOR OFF”ENTERWEIGHT XX.XCOMPRESSORWEIGHT ONXX.XCOMPRESSORAMOUNTLBA small quantity of refrigerant will probably remain in the A/C System asobserved by an increasing pressure on the Low Pressure Gauge. TheRHS780 will automatically cycle ON to continue recovering refrigerant ifpressure rises to a preset level. This automatic cycling will repeat resettingthe Recycle Hold Timer each time. When the RHS780 remains OFF for theduration of the Recycle Hold Timer value entered in Step 4 the Display willread “AMOUNT RECYCLED ” “XX.X LB 5” from the A/C System and theAttention Light will turn ON.LBOFFRECYCLED XX.XLB56.Close the Red and Blue Hose Valves and disconnect the hoses from the A/CSystem.7.Press the ENTER key. The Display will read “DRAIN RECOVERED OILNOW!”. Drain any recovered oil using the Drain Recovered Oil procedure onPage 7.8.Press the ENTER key to return to the Main Menu.ENTERDRAINOILRECOVEREDNOW!*SEEThis screen will display if there is an internal fault. Please contact RTITechnical Support. Turn the RHS780 Main Power Switch OFF.**This screen will display when the Charging Cylinder fills to capacity,approximately 39.5 lbs (18 Kg.) If this occurs, the Weight can be loweredusing the Charging procedure on Page 9 before the RHS780 can beused to recover more refrigerant. Press the ENTER key to return to theMain ARGE5Page 7
DRAINING RECOVERED OILOil is separated from the recovered refrigerant and MUST be removed followingEACH Recover/Recycle procedure to determine the amount (if any) necessary toadd into the A/C System as follows:Note:The RHS780 must be connected to power source. DrainingRecovered Oil may be done while the RHS780 Vacuum Pump is ON.1.Setup the RHS780 as shown on Page 4 and press and hold the Oil Drain Repressurization Switch for 5 seconds and then release it.2.Slowly open the valve on Oil Drain Bottle to drain any oil which may havebeen removed from the A/C System.Unless the A/C System had previously been overfilled, the RHS780 willtypically not remove enough oil to make replenishment necessary.3.Close the valve on the Oil Drain Bottle.4.Press and hold the Oil Drain Re-pressurization Switch for 5 seconds. Thispermits any residual Non-Condensable Gas to be re-circulated forreprocessing during the next recycle procedure.WARNINGFailure to perform the Drain Oil procedure after every recycleprocedure will cause the RHS780 to eventually fail.Repair of the RHS780 to correct this problem is not coveredby warranty.Page 8
WEIGHT XX.XAUTOMATIC?LB5 WEIGHT XX.XVACUUM?LBDEEP VACUUM1.Setup the RHS780 as shown on Page 4 and then turn the Main Power SwitchON.2.Attach the Red and Blue Hoses to the A/C System per the vehiclemanufacturer's instructions and open the Red and Blue Hose Valves.3.Using the Keypad, press the “Up Arrow” key two times to display “WEIGHT XX.X LB” “VACUUM? 5” and press the ENTER key. The Display will read“ENTER VACUUM” “TIME XX MIN 5”.5ENTER*A/CGOHASTO* This screen will display if the RHS780 senses a pressure in either the Highor Low Pressure Hoses. When this occurs, the A/C System must be emptiedusing the Recover/Recycle procedure on Page 6. Press the ENTER key toreturn to the Main Menu.PRESSURERECYCLE54.Press the “Up Arrow” key to change the value of the field. Press the “RightArrow” key to change to a different field. The value entered must be greaterthan zero. Press the ENTER key to accept the value. The Display will read“PERFORM LEAK” “TEST? Y/N5”.5.Press the “Right Arrow” key to move the cursor between Y and N to selectwhether or not the RHS780 pauses at the end of Vacuuming so that avacuum leak can be detected in the A/C System. Press the ENTER key toaccept the Yes or No choice. The choice entered is stored in memory andcomes up as the default the next time the procedure is used. The Display willread “ADD OIL? Y/N5”.6.Press the “Right Arrow” key to move the cursor between Y and N to selectwhether or not the RHS780 pauses at the end of Vacuuming (or VacuumLeak Checking) to allow the Adding of Oil to the A/C System. Press theENTER key to accept the Yes or No choice. The choice entered is stored inmemory and comes up as the default the next time the procedure is used.The Display will read “START? 5”.7.Press the ENTER key to start the Vacuum Pump.ENTERENTERTIMEVACUUMXXMIN5 ENTERPEFORMLEAKTEST?Y/N5 ENTERADDOIL?Y/N5The Vacuum Pump will turn On, the Display will read “TIME LEFT XX MIN”“PUMP ON” and the minutes remaining will count down on the Display. TheVacuum Pump will turn OFF when the Display reads zero minutes. ENTERSTART?8.If a Vacuum Leak Check was selected by choosing Y in Step 5 the Displaywill read “PUMP OFF XX MIN” “CONTINUE? 5” and the Attention Light willturn ON. The elapsed time since the Vacuum Pump turned OFF will count upon the Display. An increasing pressure on the Low Pressure Gauge isevidence of a vacuum leak in the A/C System. Press the ENTER key toreturn to the Main Menu or to Add Oil if selected in Step 6.9.If Adding Oil was selected by choosing Y in Step 6 the Display will read “ADDOIL NOW” “CONTINUE? 5”, and the Attention Light will turn ON. Add oil tothe correct side, either High or Low, based on the vehicle manufacturer’sinstructions, of the A/C System that will then be Charged during the Chargingprocedure on Page 9 by opening the valve on the Oil Charge Bottle andleaving it open until the correct amount of oil has left the Oil Charge Bottle.Close the valve on the Oil Charge Bottle and press the ENTER key to returnto the Main Menu.5ENTERTIMELEFT TINUE?5ENTERPage 9
WEIGHT XX.XLBAUTOMATIC?5 WEIGHT XX.XLBCHARGE?CHARGING1.Setup the RHS780 as shown on Page 4 and then turn the Main Power SwitchON.2.Attach the Red and Blue Hoses to the A/C System per the vehiclemanufacturer's instructions and open the Red and Blue Hose Valves.3.Determine the refrigerant capacity of the A/C System to be charged.5Note: 1 oz 0.02835 Kg & 1 Lb 0.45359 Kg4.Using the Keypad, press the “Up Arrow” key three times to display“WEIGHT XX.X LB” “CHARGE? 5” and press the ENTER key. The Displaywill read “ENTER CHARGE” “AMOUNT XX.X LB 5”.5. ENTERPress the “Up Arrow” key to change the value of the field. Press the “RightArrow” key to change to a different field. The value entered must be greaterthan zero. Press the ENTER key to accept the value. The Display will read“CHECK HIGH-LOW” “CHARGE SWITCH 5”.**ENTERENTERCHARGEAMOUNT LOWXX.XLEVEL TCH5XX.XLBWEIGHT 7.CHARGINGCHARGEEVACENTERDo Not Turn On The A/C System. SAE compliant refrigeranthandling stations, like the RHS780, supply refrigerant in the liquidphase. Adding liquid refrigerant to a running A/C System may causeimmediate A/C compressor failure.Press the ENTER key to start charging.The Display will read “WEIGHT XX.X LB” “CHARGING” as refrigerantleaves the Charging Cylinder. The weight displayed will be increasing fromzero to the Charge Amount entered in Step 5 plus a one ounce (0.03 KG)“Over Charge” set at the factory to compensate for hose loss. (See SettingOver Charge Amount on Page 13 to change the default value.) When theRHS780 has finished the Display will read “CHARGE COMPLETE” “EVACHOSES” and the Attention Light will turn ON.COMPLETEHOSESBased on the vehicle manufacturer’s instructions, choose Charging througheither the High Pressure Hose (preferred) or the Low Pressure Hose bypressing the top or bottom (respectively) of the High-Low Charge SelectorSwitch located on the rear of the RHS780 beside the Fill Cylinder Port .Note:ENTERThis screen will display if the RHS780 Charge Cylinder contains lessrefrigerant than the entered value. When this occurs, the chargingCylinder should be filled using the Fill Cylinder procedure on Page 5.Press the ENTER key to return to the Main Menu.58.Press the ENTER key to return to the Main Menu. The A/C System can nowbe turned on and tested by monitoring the High and Low Pressure Gauges.9.Close the Red and Blue Hose Valves, disconnect them from the A/C System,and go to Page 6 (Recover/Recycle) to Evacuate the refrigerant from theHoses.Page 10
WEIGHT tup the RHS780 as shown on Page 4 and then turn the Main Power SwitchON.2.Attach the Red and Blue Hoses to the A/C System per the vehiclemanufacturer's instructions and open the Red and Blue Hose Valves.3.Determine the refrigerant capacity of the A/C System to be charged.5 ENTERENTERAUTOMATICNote: 1 oz 0.02835 Kg & 1 Lb 0.45359 Kg4.VACUUMXXMINThe Recycle Hold Time is the amount of time that the RHS780 waits for “outgassing” or for the pressure in the A/C System being recovered to riseenough to automatically restart the recovery process. The minimum value istwo (02) minutes. The value entered is stored in memory and comes up asthe default the next time the procedure is used.5 ENTERPEFORMLEAKTEST?5.Press the “Up Arrow” key to change the value of the field. Press the “RightArrow” key to change to a different field. Press the ENTER key to accept thevalue. The Display will read “ENTER VACUUM” “TIME XX MIN 5”.6.Press the “Up Arrow” key to change the value of the field. Press the “RightArrow” key to change to a different field. Press the ENTER key to accept thevalue. The Display will read “PERFORM LEAK” “TEST? Y/N5”.7.Press the “Right Arrow” key to move the cursor between Y and N to selectwhether or not the RHS780 pauses at the end of Vacuuming so that avacuum leak can be detected in the A/C System. Press the ENTER key toaccept the Yes or No choice. The choice entered is stored in memory andcomes up as the default the next time the procedure is used. The Display willread “ADD OIL? Y/N5”.8.Press the “Right Arrow” key to move the cursor between Y and N to selectwhether or not the RHS780 pauses at the end of Vacuuming (or VacuumLeak Checking) to allow the Adding of Oil to the A/C System. Press theENTER key to accept the Yes or No choice. The choice entered is stored inmemory and comes up as the default the next time the procedure is used.The Display will read “ENTER CHARGE” “AMOUNT XX.X LB5”.9.Press the “Up Arrow” key to change the value of the field. Press the “RightArrow” key to change to a different field. The value entered must be greaterthan zero. Press the ENTER key to accept the value. The Display will read“CHECK HIGH-LOW” “CHARGE SWITCH 5”.*5This screen will display if the RHS780 Charge Cylinder contains lessrefrigerant than the entered value. When this occurs, the charging Cylindershould be filled using the Fill Cylinder procedure on Page 5. Press theENTER key to return to the Main Menu.510. Based on the vehicle manufacturer’s instructions, choose Charging througheither the High Pressure Hose (preferred) or the Low Pressure Hose bypressing the top or bottom (respectively) of the High-Low Charge SelectorSwitch located on the rear of the RHS780 next to the Fill Port. Press theENTER key when finished programming. The Display will read “CHECKHOSES” “START? 5”.Y/N5 ENTERADDOIL?Y/N5 ENTERENTERCHARGEAMOUNT XX.XLB5 ENTER*LOWLEVEL TERCHECKHOSESSTART?ENTERWEIGHT XX.XCOMPRESSORONUsing the Keypad, press the ENTER key when the Display reads “WEIGHT XX.X LB” “AUTOMATIC? 5” (this is the default screen of the Main Menu.)The Display will read “RECYCLE HOLD” “TIME XX MIN 5”.LBNote: Do Not Turn On The A/C System. SAE compliant refrigeranthandling stations, like the RHS780, supply refrigerant in theliquid phase. Adding liquid refrigerant to a running A/C Systemmay cause immediate A/C compressor failure.11. Press the ENTER key to start the RHS780 Automatic sequence.Page 11
WEIGHT XX.XCOMPRESSORLBOFFThe Display will read the “WEIGHT XX.X LB” “COMPRESSOR ON”. TheRHS780 will recover and recycle refrigerant from the A/C System andautomatically cycle OFF when a vacuum is sensed. This vacuum level canbe seen on the Low Pressure Gauge. The Display will read “WEIGHT XX.XLB” “COMPRESSOR GE5TIMELEFT TINUE?5ENTERWEIGHT XX.XLBRECYCLED DNOW!AUTOMATIC (continued)5A small quantity of refrigerant will probably remain in the A/C System asobserved by an increasing pressure on the Low Pressure Gauge. TheRHS780 will automatically cycle ON to continue recovering refrigerant ifpressure rises to a preset level. This automatic cycling will repeat resettingthe Recycle Hold Timer each time. If a Vacuum Time greater than zerominutes was entered in Step 6, the Vacuum Pump will turn ON, the Displaywill read “TIME LEFT XX MIN” “PUMP ON” and the minutes remaining willcount down on the Display. The Vacuum Pump will turn OFF when theDisplay reads zero minutes.12. Drain any recovered oil using the Drain Recovered Oil procedure on Page 7.* This screen will display if there is an internal fault. Please contact RTITechnical Support. Turn the RHS780 Power Switch OFF.** This screen will display when the Charging Cylinder fills to capacity,approximately 39.5 lbs (18 Kg.) If this occurs, the Weight can be loweredusing the Charging procedure on Page 9 before the RHS780 can be usedto recover more refrigerant. Press the ENTER key to return to the MainMenu.13. If a Vacuum Leak Check was selected by choosing Y in Step 7 the Displaywill read “PUMP OFF XX MIN” “CONTINUE? 5” and the Attention Light willturn ON. The elapsed time since the Vacuum Pump stopped will count up onthe Display. An increasing pressure on the Low Pressure Gauge is evidenceof a vacuum leak in the A/C System. Press the ENTER key to continue withthe Automatic sequence or RESET to return to the Main Menu.14. If Adding Oil was selected by choosing Y in Step 8 the Display will read “ADDOIL NOW” “CONTINUE? 5” and the Attention Light will turn ON. Add oil tothe side, either High or Low, based on the vehicle manufacturer’sinstructions, of the A/C System that will then be Charged during the Chargingportion of the Automatic sequence by opening the valve on the Oil ChargeBottle and leaving it open until the correct amount of oil has left the OilCharge Bottle. Close the valve on the Oil Charge Bottle and press theENTER key to continue.15. If a Charge Amount greater than zero pounds was entered in Step 9 theDisplay will read “WEIGHT XX.X LB” “CHARGING”as refrigerant leaves theCharging Cylinder. The weight displayed will be increasing from zero to theCharge Amount entered plus a one ounce (0.03 KG) “Over Charge” set at thefactory to compensate for hose loss. (See Setting Over Charge Amount onPage 13 to change the default value.) When the RHS780 has finished theDisplay will read “RECYCLED XX.X LB” “EVAC HOSES” and the AttentionLight will turn ON.16. Press the ENTER key. The Display will read “DRAIN RECOVERED OILNOW!”. Drain any recovered oil using the Drain Recovered Oil procedure onPage 7.17. Press the ENTER key to return to the Main Menu. The A/C System can nowbe turned on checked by monito
MAHLE Aftermarket Inc., RTI Division 10 Innovation Drive P.O. Box 3099 York, Pennsylvania USA 17402 717-840-0678 (Ext. 259) Web: www.rtitech.com E-mail: tech@rtitech.com 035-81123-00 . . Recover, Recycle, and Charge only the refrigerant for which the machine is configured. Wear safety glasses and protective gloves. Refrigerant has a very low .
